Validation: isInt overrides required validation

[RohitRox]

By default if something is required in request body interface, it is validated nicely when that param is missing.
For Eg:

interface CreatePostInterface {
    externalId: number
}

If we request body is missing externalId, we get nice 'externalId' is required

When we apply @isInt

interface CreatePostInterface {
   /** @isInt  externalId must be a number */
   externalId: number
}

This overrides the required message with the externalId must be a number

How can I maintain correct behaviour so that it returns is required for missing/empty param and must be a number for invalid number